A5025120308- Landslides and related hazards
- Hydrology and Sediment Transport Processes
- Granular flow and fluidized beds
- Fluid Dynamics Simulations and Interactions
- Fire effects on ecosystems
- Dam Engineering and Safety
- Flood Risk Assessment and Management
- earthquake and tectonic studies
- Geotechnical Engineering and Analysis
- Rock Mechanics and Modeling
- Cryospheric studies and observations
- Tree Root and Stability Studies
- Geotechnical Engineering and Underground Structures
- Soil and Unsaturated Flow
- Concrete and Cement Materials Research
- Geological formations and processes
- Microplastics and Plastic Pollution
- Geotechnical Engineering and Soil Stabilization
- Lattice Boltzmann Simulation Studies
- Soil erosion and sediment transport
- Geophysical Methods and Applications
- Geotechnical and Geomechanical Engineering
- Grouting, Rheology, and Soil Mechanics
- Transportation Safety and Impact Analysis
- Groundwater flow and contamination studies
University of Hong Kong
2016-2025
Chinese University of Hong Kong
2020-2025
HKU-Pasteur Research Pole
2021-2023
City University of Hong Kong, Shenzhen Research Institute
2020-2021
Hong Kong University of Science and Technology
2013-2020
Hong Kong Jockey Club
2017-2020
Guangzhou HKUST Fok Ying Tung Research Institute
2018-2020
Seoul National University
2016
Golder Associates (Canada)
2015
Urbanization has been linked to destructive geo-hazards that can cause loss of life, destruction property, and environmental damage. On August 14, 2017, a devastating geo-hazard chain—a debris slide, flow, sediment-laden flood—in Freetown, Sierra Leone resulted in at least 500 deaths over 600 missing persons the hundreds houses. This study uses 10 years high-resolution satellite images conduct remote sensing analysis disaster. Although rainfall was trigger, rapid haphazard urbanization acted...
The dynamics of debris flows are fundamentally governed by the interaction between solid and fluid phases. However, current approaches used to estimate impact load treat flow as an equivalent without considering solid–fluid separately from other factors. In this study, a series centrifuge tests was carried out investigate influence phases on single-surge rigid barrier. effect studied varying fraction flows. A model barrier instrumented capture induced bending moment pressure. Test results...
Structural countermeasures such as rigid and flexible barriers are commonly installed in mountainous regions to intercept mass-wasting processes. Without sufficient reliable comparable physical data, the study of impact mechanisms remains difficult not well understood. In this study, a newly developed model barrier together with used simulate either dry granular or viscous liquid impacts on these geotechnical centrifuge. The novel is made four instrumented cables controlled by spring...
The heights of rigid debris flow barriers are designed to provide adequate retention and prevent from over-spilling. Designers need predict potential runup height against a vertical wall account for Experimental investigations have previously been conducted using dry sand. A 5 m long rectangular flume was used conduct experiments both sand water, separately. combination high-speed imagery, photoconductive sensors laser study along the face barrier. effect Froude number (Fr) on examined by...
Landslide debris is a common occurrence in mountainous regions around the world that can potentially result disastrous consequences to downstream facilities. Flow-impeding structures are often constructed along flow path impede this hazardous phenomenon. Baffles type of flow-impeding structure regularly installed using empirical and prescriptive design methods as interaction mechanism influence baffle configuration on impedance not well understood. A series flume experiments were carried out...
Microplastics are abundant in aquatic environments and an emerging environmental concern. The prediction of their settling velocities is central to predictions the residence time concentration depth profiles microplastics environments. main scientific challenge improving current understanding motions that existing drag models deficient at reasonably predicting various microplastics, especially microplastic fibers. This because shape factors used cannot morphologically distinguish fibers from...
Boulders entrained in debris flow induce high impact forces on a rigid barrier. In current design practice, the concentrated load from boulders is estimated using Hertz equation with reduction factor (Kc). Separately, distributed hydrodynamic equation. The existing practice simply adding loads two equations. interaction between and during process neglected. this study, physical tests were conducted newly developed 28-m-long flume to shed light dynamics of flows without an instrumented...
Channelized debris flows surge downslope in mountainous regions and have large impact forces. Arrays of flow baffles are frequently positioned front rigid barriers to engage torrents attenuate energy. They regularly designed on empirical prescriptive basis because their interaction mechanism is not well understood. Numerical back-analysis flume experiments using the discrete element method (DEM) conducted provide insight with an array baffles. Varying configurations baffle height, a second...
Multiple barriers are commonly installed along predicted geophysical flow paths to intercept large volumes. The main criterion for multiple-barrier design is volume retained. velocity of the incoming (far-field) undisturbed also sometimes used, although this neglects influence other obstacles on characteristics. This study investigates upstream flow–barrier interaction downstream runup and impact mechanisms a dual rigid barrier system. Four physical flume tests were performed using dry sand...
Granular debris flow baffles are commonly installed in front of rigid barriers to dissipate energy and reduce the required barrier impact capacity. Despite engineering value baffles, their influence on is still not well understood. A previously calibrated discrete element method (DEM) model using a series flume experiments was adopted study effectiveness installing barrier. Froude scaling used characterize front. Different baffle configurations were examined, namely number rows, spacing...